A riding mower has a frame supported by a plurality of wheels including a pair of front drive wheels covered by front fenders. A plurality of cutting units are arranged in advance of the frame. The operator sits on a seat atop the frame at the front of the frame. The operator mounts and dismounts the seat from behind the front fenders and the front wheel and not from the front, access to the seat from the front being prevented by the placement of the cutting units. A pivotal armrest along one side of the seat normally blocks access to the seat from that side. However, the armrest can be pivoted to a raised position in which it clears the seat to allow the operator to reach the seat from that side of the seat. The armrest carries a lift and lower control for lifting and lowering the cutting units and a start/stop control for starting and stopping the operation of the cutting units, the operational controls moving with the armrest as the armrest moves between its lowered operational position and its raised position.